Dual-Temperature Engine Cooling for Knock Control and CO2 Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current internal combustion engines face challenges in balancing low coolant temperatures in the engine head for knock mitigation and high coolant temperatures in the engine block for reduced emissions, while also effectively capturing carbon dioxide emissions.
Innovation Solution
A system and method that involves feeding coolant to the engine head and block at different temperatures, using a restricting valve to increase engine block coolant temperature, and recirculating a portion back to the engine head, combined with a carbon capture system utilizing heat exchangers, an absorber, and a regeneration column to capture carbon dioxide from the exhaust gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low coolant temperature is maintained in the engine head, then knock is mitigated, but emissions increase due to reduced oxidation of fuel molecules
Solution Approach 1:
The coolant system is segmented into two separate circuits: a first coolant circuit that maintains low temperature in the engine head for knock mitigation, and a second coolant circuit that maintains high temperature in the engine block for emission reduction. This segmentation allows each region to operate at its optimal temperature independently.
Solution Approach 2:
Different temperature conditions are applied to different parts of the engine: the engine head receives coolant at a first temperature optimized for knock prevention, while the engine block receives coolant at a second temperature optimized for emission control. This local quality approach tailors thermal conditions to the specific requirements of each engine component.
2Object-generated harmful factors
If high coolant temperature is maintained in the engine block, then unburnt hydrocarbon and particulate matter emissions are reduced, but knock increases in the engine head
Solution Approach 1:
The coolant system is divided into two independent circuits allowing the engine block to operate at high temperature for particulate matter oxidation while the engine head operates at low temperature to prevent knock. Each circuit can be controlled independently to optimize for its specific function.
Solution Approach 2:
The engine block is provided with high temperature coolant to enhance oxidation of particulate matter and unburnt hydrocarbons, while the engine head is provided with low temperature coolant to maintain knock resistance. This local differentiation of thermal properties resolves the contradiction between emission control and knock prevention.
3Device complexity
If a single coolant temperature is used for both engine head and engine block, then system complexity is reduced, but neither knock mitigation nor emission reduction can be optimized
Solution Approach 1:
The coolant system is segmented into two separate circuits with independent temperature control, allowing optimization of both knock mitigation and emission reduction. Although this increases system complexity, it enables simultaneous achievement of multiple performance goals that cannot be met with a single temperature system.
4Object-generated harmful factors
If carbon dioxide capture technology is integrated into the mobile engine system, then carbon dioxide emissions are reduced, but system complexity and weight increase
Solution Approach 1:
The dual-circuit coolant system serves multiple functions: it provides temperature control for knock mitigation, temperature control for emission reduction, and heat transfer for carbon dioxide capture. By making the coolant system multi-functional, the need for separate systems is reduced, thereby limiting the increase in overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the likelihood of knock, minimizes emissions, and enhances engine efficiency by optimizing coolant temperatures, allowing for effective carbon dioxide capture and storage.
Implementation Method 1
A first portion of the engine head coolant flows through a restricting valve to increase a temperature of the first portion of the engine head coolant
Implementation Method 2
a carbon capture system utilizing heat exchangers
Data Source
AI summary
A method to reduce carbon dioxide emissions from an engine including combusting fuel in the engine to yield exhaust gas, feeding a coolant to the engine head at a first temperature, and recovering an engine coolant at a second temperature. The method further includes flowing a first portion of the engine head coolant through a restricting valve to increase a temperature of the first portion of the engine head coolant to a third temperature, feeding the first portion of the engine head coolant from the restricting valve to the engine block, and recovering an engine block coolant at a fourth temperature. A second portion of the engine head coolant is recirculated back to the engine head. A system including an engine head, an engine block, a restricting valve in a first flow line, and a second flow line exiting the engine head to recirculate coolant back towards the engine head.